libavif

This library aims to be a friendly, portable C implementation of the AV1 Image File Format, as described here:

https://aomediacodec.github.io/av1-avif/

It can encode and decode all AV1 supported YUV formats and bit depths (with alpha).

It is recommended that you check out/use tagged releases instead of just using the main branch. We will regularly create new versions as bug fixes and features are added.

Usage

Please see the examples in the "examples" directory. If you're already building libavif, enable the CMake option AVIF_BUILD_EXAMPLES in order to build and run the examples too.

Installation

libavif is a package in most major OSs.

Windows

vcpkg install libavif

You can also download the official windows binaries on the release page.

macOS

Homebrew:

brew install libavif

MacPorts:

sudo port install libavif

Linux

Debian-based distributions:

sudo apt install libavif-dev

Red Hat-based distributions:

sudo yum -y install libavif

MinGW

For the "default" MSYS2 UCRT64 environment:

pacman -S mingw-w64-ucrt-x86_64-libavif

Build Notes

Building libavif requires CMake.

No AV1 codecs are enabled by default. Enable them by setting any of the following CMake options to LOCAL or SYSTEM whether you want to use a locally built or a system installed version (e.g. -DAVIF_CODEC_AOM=LOCAL):

• AVIF_CODEC_AOM for libaom (encoder and decoder)
• AVIF_CODEC_DAV1D for dav1d (decoder)
• AVIF_CODEC_LIBGAV1 for libgav1 (decoder)
• AVIF_CODEC_RAV1E for rav1e (encoder)
• AVIF_CODEC_SVT for SVT-AV1 (encoder)

When set to SYSTEM, these libraries (in their C API form) must be externally available (discoverable via CMake's FIND_LIBRARY) to use them, or if libavif is a child CMake project, the appropriate CMake target must already exist by the time libavif's CMake scripts are executed.

Static Builds

When set to LOCAL, these libraries and the other dependencies will be pulled locally by CMake to known-good versions.

To override a local dependency version or to use a custom build of a dependency, first run the associated script in the ext/ subdirectory.

Tests

A few tests written in C can be built by enabling the AVIF_BUILD_TESTS CMake option.

The remaining tests can be built by enabling AVIF_BUILD_TESTS and setting AVIF_GTEST to SYSTEM or LOCAL.

Fuzzing test instructions are also provided in ext/oss-fuzz/README.md.

Command Lines

The following instructions can be used to build the libavif library and the avifenc and avifdec tools.

Build using installed dependencies

To link against the already installed aom, libjpeg and libpng dependency libraries (recommended):

git clone -b v1.1.1 https://github.com/AOMediaCodec/libavif.git
cmake -S libavif -B libavif/build -DAVIF_CODEC_AOM=SYSTEM -DAVIF_BUILD_APPS=ON
cmake --build libavif/build --parallel

Build everything from scratch

For development and debugging purposes, or to generate fully static binaries:

git clone -b v1.1.1 https://github.com/AOMediaCodec/libavif.git
cmake -S libavif -B libavif/build -DBUILD_SHARED_LIBS=OFF -DAVIF_CODEC_AOM=LOCAL -DAVIF_LIBYUV=LOCAL -DAVIF_LIBSHARPYUV=LOCAL -DAVIF_JPEG=LOCAL -DAVIF_ZLIBPNG=LOCAL -DAVIF_BUILD_APPS=ON -DCMAKE_C_FLAGS_RELEASE="-static" -DCMAKE_EXE_LINKER_FLAGS="-static"
cmake --build libavif/build --parallel

Prebuilt Binaries (Windows)

Statically-linked avifenc.exe and avifdec.exe can be downloaded from the Releases page.

Development Notes

Please check the wiki for extra resources on libavif, such as the Release Checklist.

The libavif library is written in C99. Most of the tests are written in C++14.

Formatting

Use clang-format to format the sources from the top-level folder (clang-format-16 preferred):

clang-format -style=file -i \
  apps/*.c apps/*/*.c apps/*/*.cc apps/*/*.h examples/*.c \
  include/avif/*.h src/*.c src/*.cc \
  tests/*.c tests/*/*.cc tests/*/*.h

Use cmake-format to format the CMakeLists.txt files from the top-level folder:

cmake-format -i \
  CMakeLists.txt \
  tests/CMakeLists.txt \
  cmake/Modules/*.cmake \
  contrib/CMakeLists.txt \
  contrib/gdk-pixbuf/CMakeLists.txt \
  android_jni/avifandroidjni/src/main/jni/CMakeLists.txt

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License

Released under the BSD License.

Copyright 2019 Joe Drago. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.